There are a few prior works on federated learning for large-vocabulary ASR. For example, in [1]}, federated learning is applied with an end-to-end (E2E) model on the French set of the Common Voice dataset [2]}. In [3]}, an RNN-T architecture ASR [4]} is used on the LibriSpeech corpus, and [5]} applies FL to a hybrid ASR model. Additionally, in [6]} Dimitriadis et.al. introduce a federated learning setup for ASR based on an end-to-end system.
